Biblical commentaries are an important tool for every scholar. They serve as an introduction to many of the critical scholarly discussions concerning the biblical book in question as well as provide important bibliographic information for those that desire to go more in-depth than what many commentaries do.
The commentaries below are, for the most part, from pre-20th century; however, that does not diminish many of the contributions they have made to biblical scholarship. As with most things, many of these commentaries are "out-of-date" in many respects but that does not dismiss many of the important information provided.
These links will take you to the OADTL catalog. Once their click on the View eBook button to gain access to the materials.